How to Build a Stone Interior Wall


Stone interior walls can be a striking focal point in the entryway of your home or can provide interest as dividing walls. Building a stone interior wall from slate, cobblestone or river rock is a project you can finish in a day or two. Whether you decide to fill a wall with slate or add a small section as a divider, building a stone interior wall will change the look of whatever room you choose.

Things You'll Need

  • Thick plastic sheeting Mortar mix Trowel Slate
  • Measure the area of the room where you plan to build your stone wall. Take the dimensions to your local home improvement store or landscape supply store and they will advise you on the amount of slate and mortar mix you will need. You can purchase all of the materials for this project at your local landscape supply store. You can also use cobblestones or large river rock in place of slate.

  • Lay the thick plastic sheeting in close proximity to the future stone wall so your slate will not harm the existing flooring. Place the slate on the plastic. Cover the floor around the area for your wall with plastic as well, to protect it from stray mortar. You can build your wall on top of hardwood or tile flooring, but carpet and carpet padding should be removed so you can build the stone wall on a solid surface, such as the plywood subfloor.

  • Mix the mortar in accordance with the manufacturer's instructions. Place a thin layer of mortar on the floor where you will stack your slate interior wall. Drag the notched edge of your trowel along the surface of the mortar. Place a row of stone on top of the mortar, pressing it firmly into the mortar.

  • Alternately layer the mortar and the stone as you stack your interior wall to the desired height. Let the mortar dry. If you choose cobblestone rather than slate, you will need to place mortar all around the stones, not just on the bottom. You will also need to stagger the mortar joints so that the stones are not directly on top of each other. For cobblestones, bricks or river rock, place the second layer of stone in the middle of the vertical mortar joint on the first level. Build subsequent levels the same way, always staggering the stones.

  • Remove any mortar mix that goes astray before it dries. Discard the plastic covering before the mortar dries as well--it is easier to remove wet than dry.

Tips & Warnings

  • Manmade stones are lighter than natural stones and may be easier to work with.
  • Wear gloves when working with stones and mortar.

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